Sound-box for sound recording and reproducing machines.



J. C. ENGLISH.

SOUND BOX FOR SOUND RECORDING AND REPRODUGING MACHINES.

APPLICATION FILED MAY 31, 1906.

Patented Nov. 23

A TTOR .IOIZII/QEI "BY WITNESSES will be held yieldingly in place to oscillate UNITED STATES, PATENT OFFICE.

JOHN C. ENGLISH, OF CAMDEN, NEW JERSEY, ASSIGNOR TO VICTOR. 'IAIIKING MACHINE COMPANY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Nov. 23, 1909.

Application filed May 81, 1906. Serial No. 819,428.

tion are, to provide a simple and durable mounting for a Stylus'bar by which the bar without restraint upon a fixed axis; and to provide other improvements as will appear ereinafter. In. the drawings, Figure 1 is an elevational view, partly in section, showing the orifice 2' in the rear end thereof to whic stylus bar mounted upon the sound box casing in accordance with my invention; Fig. 2 1s a bottom plan view of the same, part of the stylus bar being removed to show the mounting for the-stylus bar; Fig. 3 is a vertical longitudinal section on the line 33 of Fig. 2; Fig. is a vertical longitudinal section on the hue 44 of Fi 2; Fig. 5 isa correspondin section on e line 55 of Fig. 2'and- 6 is a- 'rspective view of the support upon whic the stylus bar is mounte V The sound box casing 1, may be of the usual opened end construction havin lllln t e sound conveying tube'may. be connected in any suitable manner. The diaphragm 3 may also be of any well known type, but I refer to-employ-one in which the p eriphera ortions are turned at right angles to the ace of the diaphragm to form a cylindrical flan e 4 by whlch the whole diaphragm is sti ened and by which it is secured within the sound box, either 'b cement or by its contact with the walls 0 the casing.

Throiglgh one of the sides of the casing is provide an opening 5, which may be of any suitable sha e and of a' size to permit the insertion of t 'e stylus bar' therethrough and on opposite sides of the said opening I provide grooves 6 ofany suitable cross section, and arranged in a plane-parallel to the plane of t e diaphragm.

is a'fu l, clear, and ex- I Attached at its inner end to the dia phragm and passing throu h the o enin 5 1n the casing of the sound box, is t e stylus bar 7, the lower end of said stylus bar bein r provided with the usual socket 8 in which the needle 9 may be secured in any well known manner.

The stylus bar 7 is mounted on a stylus supporting bar 10, which in this instance is formed of a square rod bentinto substantially a U-shape, as shown in Fig. 6. The middle of this stylus supporting bar 10 is left square as at 11, and is tightly fitted within a notch 11 cut in the sideof the stylus bar. The stylus bar support may be retained in said notch either by being braced therein', or b I ends 12 of-t e stylus bar support are provided with knife edges 12 adapted. to be seated in the grooves or bearings 6 in the sound box casing, and on either side. of the square portion 11. of the stylus bar support I provide reversed knife edges 13 which are in alinement with the knife edges 12. \Vhile I have shown the stylus bar support as made of a rod Square in cross section, the said support may be made of any desired section, so long as it can be rigidly secured to the stylus bar, and can be provided with a surface which when engaged by the spring, or other'yieldingl means will be held withln its bearings wit out ofiering any resistance 'to the free oscillation of the stylus bar.-

Secured to the sound box casing 1 is a a-pin, as desired. The outerspring 14, the object of which is to yieldingly hold the knife edges 12 within the grooves 6 of the sound box casing. The form of spring which I have es ecially adapted ends 'to t e sound box casin by screws 16-16. On opposite sides 0 said body portion 15, and extending lengthwise of the ody portion in opposite directions and inwardly ends of which are cut upwardl as shown in Fig. 5, to engage the knife e. ges 13--13 of the stylus bar support, the sprmgsextending transversely of the knifeedges; The main or body portion of the sprlng 15 is provided with a suitable aperture 15 through which the stylus bar asses. Instead of the leaf spring for hol 1n thestylus bar within its bearings, any ot or form are leaf 5 rings 17-17 the free for this purpose consists o a strip or plate of thin s ring metal secured at opposite" a mounting ofpring which will perform the same functions may be used without departing from the spirit of my invention.

In a sound box constructed and assembled in the manner above set forth the springs 1717 act upon the stylus b'ar support on a knife edge which is in alinement with the knife edges upon which the stylus bar oscillates. As the stylus oscillates, there is no relative'motion between the stylus bar support and the springs 17 17, which hold the stylus bar support within its bearings; that is to say, the unetion of the spring is merely to hold the stylus bar support in position on the sound box without applying any tension to the stylus bar or offering any resistance to the tendency of the same to freely oscillate; upon its hearings in response to the vibrations transmitted through the same. 7

While I have in the above specification described in detail one embodiment of 'my invention, changes in details and arrangement of the various parts may be made Without departing from the spirit and scopeof' my invention as poin'tedout in theappe'nded claims.

VVliatI claim as new and desire to protect by Letters Patent of the United States is 1. In a sound box, the combination with a stylus barfprovided with a knife edge, of

arm extending transversely'of and bearing against said knife edge to hold said bar upon its mounting.

2. In a sound box, the combination with a casing having anaperture in one side thereof, of a stylus bar extending through r said stylus bar, and a spring said a erture and journaled upon the outside 0 said casing, and an aperturcd plate secured to the outside of said casing and surrounding said bar to hold said bar yieldingly in position, said plate being provided with a spring arm integral therewith and bearing against a knife edge provided therefor on sald bar, and extending transversely of said knife ed e.

8. In a sound ox, the combination with a stylus bar, of a mountin therefor and an apertured plate surrounding said bar, said plate being provided with oppositely extending spring arms integral therewith and extending transversely of and contacting with" knife edges provided on said stylus bar to hold said bar upon its mounting.

4. In a sound box, the combination with a casing provided with an aperture in one side thereof, of a stylus ba-r extending through said aperture, trunnions carried by said bar and mounted to oscillate in grooves provided therefor in the surface of'the sound box casing, and a spring plate provided with an aperture through which said bar extends, said plate being secured to said casing and being provided with spring arms integral therewith and bearing against and extending transversely of knife edges pro-* vided therefor upon said trunnions to'hold said bar yieldinglyin position.

In witness whereof I have hereunto set my hand this 28th day of May, A. D. 1906.

JOHN C. ENGLISH.

Witnesses:

ALEXANDER PA RK, ALSTON B MoUL'roN,

It is hereby certified that in Letters Patent No. 940,796, granted November 23,

1909, upon the application of John C. English, of Camden, New Jersey, for an improvement in Sound-Boxes for Sound Recording and Reproducing Machines.

an error appears in the printed specification requiring correction as follows: Page 1,

line 70, the word braced should read brazed; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 14th day of December, A. D., 1909.

[SEAL] (3. C. BILLINGS Acting Commissioner of Patents. 

